Apparatus for forming tubing or the like into coils



Nov. 4, 1952 A. w. PAYNE 2,616,156

APPARATUS FOR FORMING TUBING 0R THE LIKE INT0 coILs Filed April 16, 19481 sheets-sheet 2 26 INVENToR.

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- Thetrailingend of the tube, accordingly,

Patented Nov. 4, 1952 -UNITE'D STATES PATEN l5I,

APPARATUS FORFORMING TUBING() LIKE .INTO COILS Y Arthur Payne, Detroit,MichQ'- Bundy Tubing Company, Detroit poration of Michigan ApplicationApril 1c, 194s, senin,l

9 claims. (01.29433) 1 `This invention relates to an. apparatus forshaping llong Work pieces into coilsof serpentine form and it has to doparticularly with .the lfashioning of tubing .into serpentine coils.

An apparatus Whichembodies .bending mecha- 5 nism and other vrelated.parts for bending Work pieces .such as tube into the shape of serpentinecoils,'is 'fully disclosed vand claimed in co-pendingv applicationSerial No. 687,668 filed August 1, 1946, and now patent No. 2,454,290.Such coils .of tubing are useful as heat exchange devices and areadmirablyadapted -for .use `in .the refrigerateE ing industry. Amanufacturer of heat exchange.: equipment and particularly one whichmanuf'ac---gtures such equipment more or less on the production basis,sometimes requires that thel.di=, mensions of the coil and Athelocations ofthe; ends .of the tubing be accurately maintained?? Where -alength lof tube is fed hto a bending,`v chine, the position of theleading end ca` accurately maintained relative to the jsev ral;y bendsof the coil. But as the tubing fed; o. the machine, ina step by stepmanner, Withffsllf cessive bends made therein, it Will b e appreciatedthat certain variations unavoidably -lke,-...fl3lace.. with the resultthat these variations V.are add" and all accumulate at the trailing.y@11d Qi-the tube. One length of tube may be slightl or .more tough thananother and .diff-ere tions along the length of a single tube-.Inriamachine.fiseshownnas having a.;

aszto metal hardness `or toughness:..lfsnltingv4 n, g, some variation asto the position` ots-thatrailingg. suipablgbasemmwhichlgendvsimamupward; end of the 1Sube .as the coil'has beenforned.;direction. @mam-...bending psci11atmg-fshafu@2.,

igable a.

Whileetheitable orflsupportiisshownV at 3;,- Afpostv to be misplacedconsiderablyiieventtheughffthe-. 4.mayextenupwardiyffromthetabieandmayaWork Piece W as a'cu'atew'cut, Q-:CSIQ lllghf: be provided withan-.overhangingw.arm..5 :Which-f-` before beine rbent inw theSerpentneicol- 'l may.support.fmechanismfffor.:stabilizing,thereon Thepresent inventicn'ams to?. royidesan m-f'ss'.swungfvzin.amfbsciliatingwfashionson:.then proved apparatus whichern-bodied .,mechanisrnk,

for bending tube into a serpentine considerable -automaticitmgttopltheginachine; near the .end of its operation 'nl arming-fthe; coily.and cut off the trailing..en .th-.fl.1be.=.at.. an accurate location,treat. t1, e1to.;removef, burrs .incident to thev cutting opl ration and1.3.0,. then start the bendingInachirnto-xslalse:tlziefflnal operationson the tube so that the trailing .endi. of .the tube isaccuratelyylocated;with-frespect o theremaining portionfqfnthe coil .Anapparatus fongcarrying.:.outwthenn en tio disclosedin theaccompanyingidravtings': :-fy e e Fig. 1 is a side feleva'tional- .viewiofrrfa :ma-chine.; for.' bending, tubing into serpentine .coilsfshowingithe cutoifmecharsmeapplied thereto."-

Figi.' :2;.is an enlarged@ cross'fsectionalf l'Viewtaken -15 applicableto tne tube and is normally yieldably urged toward the bending rollersby a spring I8,

the action of the spring being limited by a suit-` able stop I9.

In the operation of the bending machine the tube is fed into themachine, as shown in Fig. 4, the desired distance and then the feedingaction is stopped and the clamp I1 applied. Starting from the Fig. 4position, the shaft 2 oscillates to an extreme position, as shown inFig. 5. Thus, the roller 9 forms or bends the tube as at B around theforming roller 8. Inasmuch as, in this action, the roller 8 is seated inits recess I5 and swung around the axis of the shaft 2, the bar I3 andthe support for the feeding rolls are caused to oscillate which ispermitted by the spring I 8. From the position shown in Fig. 5, theshaft 2 oscillates back to the position shown in Fig. 4,

and the tubing is again fed forwardly a deter-I mined amount. The clampI1 is again applied to the tube and the shaft 2 now oscillates in thereverse direction to a position just opposite that shown in Fig. to makethe next succeeding bend in the length of the tube. `In this action, theroller 9 seats in its recess I5 and the roller 8 fashions or forms thetube about the roll 9. Upon the making of this second bend, the shaft 2oscillates back to the Fig. 4 position, the tube is fed forwardly againand one complete cycle of operation of the bending rollers is thuscompleted with two bends being formed. In this action, it will beappreciated that the coil, as shown in Fig. 3, is swung back and forthon the table 3. The leading end of the tube is the end shown at L withthe series of bends at B made therein, while the trailing end of thetube is shown at T.

The cut 01T and burring mechanism are positioned just upstream from thepropelling rollers I2 and may be disposed on a suitable base 25. Thereis a xed central standard 26. This standard has an arm 21 for supportinga controlling electric switch operable by the tube. As shown in Fig. 11,the switch has a housing 28 and a bell crank member 29 pivotally mountedas indicatedwith anupper inclined end 30 which cooperates `with aninclined surface 3| vof a fixed recessed member, the bell crank beingacted upon by a coil spring 33. A length of tube may be positionedby'being pushed between the converging elements 30 and 3 I and situatedin a recess 32. When the end of the tube rims out of the recess thespring 33 actuates the bell crank to the dotted line position shown inFig. 11, and this actuates the controlling switch 25 as will presentlybe' seen. Asr

will be noted by reference to Fig. 6, this switch and its operating armis positioned upstream relative to the bending machine.

The central fixed member also carries a rather hook-shaped tube support35 having a notch for receiving the tube as shown in Fig. 2. The spport35 is mounted on an arm 36 which is pivoted as at 31 and held normallyagainst a ystop 38 by a spring 39. The spring 39 reacts against a frame40 and extending through the spring is a link 48 with a nut 49 adjustedagainst the side of the' frame 40 opposite the spring. This support, aswill be seen by reference to Fig. 6 and Fig. 3, is at the end oppositethe switch 28 and adjacent the advancing rolls I 2. I

The frame 40 pivoted as at 4I andY carries a cutting saw 42 pivotedY asat 43 and driven by a belt 44. The belt runs over a pulley 45 which isdriven by a motor 46 mounted on the pivoted support 40.Y

A second pivoted support 50, mounted as at 5|, carries a driving motor52 for operating a rotary 4 burr removing tool 53. Between the motor 52and the burring tool 53 is a housing 54 which contains mechanism knownto those versed in the art which causes the burring tool 53 to advanceaxially when the motor 52 is set into operation.

An air cylinder 56 with ports 51 and 58 into opposite ends is pivotallymounted on the frame 50 as at 59 and in the cylinder is a piston 60whichY has a piston rod 6| pivotally connected to the xed standard 26 asat 66.

There is a thrust connection between the pivoted supports and 50, shownherein as in the form of a sleeve 62 pivotally connected to the. frame40 as at 63 with a rod 64 telescoping into the member 62 and pivotallymounted to the frame as at 65. The member 62, as mentioned, is hollowbut has a determined depth so that the end of the rod 64 may strike thebottom` of the hollow portion. There are cooperating stops between thexed frame 26 and the pivoted support 50 as shown respectively at 68 and69. There is a controlling switch 10 having an actu, ating arm with aroller thereon, as shown at 1|, arranged to be contacted and actuated byan actuator or stud 12 on the support 50.

The support 40 is yieldably acted upon by a coil spring 15 mounted on arod 16 which is pivotally mounted to the support 40 as at 11. The rodextends through the fixed support 26 and through the support 50 with oneend ofthe spring reacting against the support 26 and the other endacting upon the washer 18. This, as will be appreciated byreference toFig. 2places a load on the support 40 tending to swing it clockwise asNFig. 2 is viewed.

In the lnormal inactive position, the support 40 cannot swing under theaction of the spring 15 because of a pivotally mounted blocker elementpivoted to the yiixed standard as at 8| and having a roller 82positioned to be abutted by a stop screw 83 on the frame 40. Thisblocker or detent 80 is acted upon by a spring 84 (Figs. 2,

and 9) to hold it in normally blocked position as shown in'Fig. 2. Anactuating link 90'pivoted to the support 50 as at 9| (Fig. 9) isarranged' to pass through an aperture 92 in the center standard 26 andthe blocker 80 has an or detent 93 to be acted upon by the link 90.

The burring tool, which may be covered by a protector |00, is arrangedto eifect certain controlling operations and, as shown in Fig. 12, it isprovided witha collar IDI for acting upon a yoke of a lever |02pivotally mounted at |03. This lever is acted upon by a coil spring |04-which keeps the yoke applied to the collar |0 I Mounted on the fulcrum|03 to move with the lever |02 is an arm |09 having a finger detent |06acted upon by a spring |01. The spring holds the detent againsty ashoulder |05. This arm is arranged to actuate the switch arm |08 of acontrolling electric switch I I0. With the arrangement shown, it will beappreciated that the linger |06 will actuate the switch arm |08 as thelever |02 swings in one direction but is ineffective thereon when thelever swings in the opposite direction. This mechanical operation of theswitch to accomplish the desired function as will presently be seen.

In the operation ofthe mechanism, andparticularly during the time thebending mechanism is in operation making the bends in the work piece, asabove pointed out, the tubing W lies in the recess 32 (Fig. 11) and thusthe switch 28 is conditioned to maintain the operation of the' bendingmachine. This switch is connected by suitable wiring toV controlmechanism (notshown) abutment,

||0 is but Oneway,

for .this purpose. The matter of electrical wiring is-zwithinthe skillof anyone skilled in the art ofelectrical controls. The tubing may befed forwardly with step by step movement-with the bending headoscillating back and forth as above described in ,order to make theseveral bends in the. tube. 1

The tubingr also lies in the notch of the `support 3 5. so that it isadequately supported adjacent the cutter blade l42. At this time, themechanism is inthe 4position shown in Fig. 2 with air under pressurev.maintained in the cylinder through the port 51. The spring 15 is undercompression tendingto pull the support 40 to the right but the supportis blocked by the element 80. As soon as the trailing vend of the tubemoves out of the notch 32 ,the switch arm 30 swings under the action ofthe spring 3| and the controlling `switch v28 is thereby actuated. Thisserves, through suitable control means (not shown) to stop the operationofl thebending machine with the coil Acompletely formed except for thelast bend. More specically,r the trailing end of the tube will run outfrom under the arm 30 in the next to the last feeding action and thenthe bending machine will complete the next to the last bend and willcome to rest -in the position shown in Fig. 3. The actuation of theswitch 28 also energizes the motor 45 for the operation of the saw andinitiates ventering air under pressure into the cylinder through port 58with the port 51 connected to exhaust.

The machine has come to -rest with the trailing end of the tube inapproximately the position as indicated at T in Fig. 3 with thetube'adjacent its end supported because it lies in the notch ofthe-support 35. The introduction of air into the cylinder through port58 causes the pivoted support 5|] start to move counter-clockwise on itspivotal mounting, due to the fact that the cylinder 56 iscaused to movewhile the piston remains stationary because of its attachment to thecenter standard 26. This movement is a relatively steady constantmovement as distinguished from a quick action and the link 90 engagesthe detent 93 and trips the blocker 80 to the position shown in Fig. 9.The frame 40 is thereby quickly released'and the spring 15, which isunder compression, quickly swings the frame 40 a few degrees clockwiseon its pivotal mounting so that the saw 42, which is now rotating cutsthrough the tube. The tube is adequately supported on the bottom of thegroove of the support 35 for this purpose. During the cutting action, itwill be remembered that the'frame 50 continues to swing`counterclockwise, as Fig. 2 is viewed. The frame 40 is so pulled by thespring until the frame strikes the stop'95 on the center standard 2B. Inthis action, the support 36 remains in position although the spring 39is compressed as the frame 40 shifts. This is because the support 36 isheld against the stop 38. This movement of the frame 40, and theresultant sawing off of the end of the tube is veryquickly accomplished.The relative position ofthe-elements with severed end of the tubefalling away is indicated in Fig. 8.

The frame 50 continues swinging counterclockwise, as Fig. 2 is viewed,and the rod 64 ultimately seats in the bottom of the sleeve 62 andcontinued movement `of the frame member 50 counter-clockwise pushes theframe 40 counterclockwise on itsl mounting to a position `as indicatedin Fig. 1. In .this action, the link 48 pulls the supporting arm 36 andthe support 35 out of the -way sothat thezburr removing-tool may bepositioned on gthe-center .of the work. 'In this 6; position the Stop 68strikes the stop 6.9 and the applied air pressure hold the parts in thelposition shown in Fig. 7 with the burring tool ready to operate.

As the support 50 approached a position where the burring tool is on thecenter of the tube the actuator 12 engages the larm 1| of the switch` 10to thus energize themotor 52 for the burr removing tool. The motorstarts Voperating to rotate the burring tool 52 and it is advancedaxially of the` tube by the mechanism in housing :5.4 to the dotted linepositionshown in Fig. 12, thus burring the 4tube and then vthe toolretracts .auto-l matically. As the` b-urr removing tool shifts'to theright, as Fig. l2 is viewed, the finger |06. does not actuate the switchvarm. |88.. Asthe burr removing. tool moves back to the `positionshownin Fig. 12, the finger |06 momentarily` actuates, the swinging arm|08 which momem. tarily energizes switch IIB. This has theeiect ofreversing the air in the cylinder 5G. Air .is now entered through theport 51. and the port 58 connected to the exhaust so that the swingingsupport l50 .starts to swing clockwise from one position shown in Fig. 7fback to the at rest. position shown in Fig. 2. One of the iirst thingsythat happens is that the switch arm 1| is .re-1

the iroller .82 of the blocker element 80, the blocker element havingbeen returned to blocking position by its spring :84. At this time thesupport 35 is again positioned to receive va tube.v

The operator now places another tube in position by moving it downwardlybetween the relatively inclined parts 3|) and 3| thus throwing theswitch arm ,3D and setting the machine into operation and discontinuingoperation of the motor 46 which operates the saw. The new tu-be ispositioned preferably so that its leading end abuts the sawed off andburred trailing end of the previous tube and as the switch28 is thusenergized, the bending machine is again conditioned for operation. Thenext bending operation will be that of swinging the coil (Fig. .3).clockwise to the dotted line position thus making the last bend of thecoil. At the completion of the lastv bend the trailing end of thecompleted coil is in a position as indicated at T in Fig. 3. leading endof the next inserted length of tube which is shown at L' in Fig. 3. Thecompleted.

coil is released from the clamp |1 and is removed from the machine asthe new tube is yadvanced into position so that the rst bend can be madethereon. 'Ihis completes the cycle of operation and the bending machinecontinues to `operate until the trailing end of the tube being operatedon runs out from under the switch arm 39 which initiates the action ofsawing off the trailing end and burring the same.

Thus, in reiteration, it will be observed that whenever the trailing endof a length of tube being operated on cornes into position andreleasestheswitch arm 3l), that the bendingoperation ceases, the trailing end ofthe tube is cut off and thenburred with the cut off saw and burring toolmoving back to idle position, and the machine is set again intooperation by the placement Vof the next length of tube to Vbe worked.

It was pushed into this position by the- I claim:

1. Apparatus for cutting and removing the burr from the end of a longWork piece, such as tube, comprising, a rst movably mounted supporthaving a cutting tool normally positioned at one side of the work piece,a second vmovably mounted support having a burr removing tool positionedat one side of the Work piece, means yieldably biasing the first supportin a direction tending to cause the cutting tool to move into the workpiece, a blocking element for preventing such movement of the said rstsupport, operating means for moving the second support with the burrremoving tool moving toward an axial position relative to the workpiece, means operable by movement of the second support to release theblocking means for movement of the rst supportfto cause the tool to cut01T the trailing end of the work piece, means interassociated with thefirst and second supports so that continued movement of the secondsupport moves the first support to position the cutting tool to one sideof the Work piece, means operable to actuate the burr removing tool toact upon the severed end of the work piece, and control means forcausing the operating means to move the second support back to itsinitial position leaving the iirst support in its blocked position.

2. Apparatus for cutting and removing the burr from the end of a longwork piece, such as tube, comprising, a rst movably mounted supporthaving a cutting tool normally positioned at one side of the Work piece,a second movably mounted support having a burr removing tool positionedat one side of the work piece, means yieldably biasing the rst supportin a direction tending to cause the cutting tool to move into the workpiece, a blocking element for preventing such movement of the said rstsupport, operating means for moving the second support with the burrremoving tool moving toward an axial position relative to the workpiece, means operable by movement of the second support to release theblocking means for movement of the rst support to cause the tool to cut01T the trailing end of the work piece, means interassociated with therst and second supports so that continued movement of the second supportmoves the rst support to position the cutting tool to one side of thework piece, means operable to actuate the burr removing tool to act uponthe severed end of the work piece, and control means for causing theoperating means to move the second support back to its initial position,said blocking means being restored to blocking conf dition as the secondsupport moves to its initial position so as to block the rst support inits initial position.

3. Apparatus for cutting and removing the burr from the trailing end ofa long work piece, such as tube, which is being fed lengthwisecomprising., a fixed standard positioned substantially on the centerline of the work piece, a rst pivoted support on one side of thestandard having a cutting tool thereon, a spring acting upon the supportand reacting against the standard tending to move the support in adirection so that the cutting tool moves toward the work piece, amovable blocking element on the standard for blocking the rst supportand preventing such movement, a second support pivotally mounted on theother side of the standard, a burr removing tool carried by the secondsupport, operating means for swinging the second support tc shift theburr removing tool toward the Work piece, a movable controlling elementcarried by the standard and actuated as the trailing end of thetube`moves therefrom to set the last mentioned means into operation, atrip member on the second Support for trippingthe said blocking meansfor movement of the cutting element into the work piece to sever thetrailing end thereof as the second element is moving toward the workpiece, interengaging means on the two supports for causing the secondsupport to shift the rst support thereby moving the cutting tool awayfrom the work piece so that the burr removing tool may be positioned onthe axis of the work piece, control means operated by the second supportto set the burr removing tool into operation substantially when the saidtool is on the axial center of the work piece, control means actuated bythe movement of the burr removing tool to cause the operating means tomove the second support back to its original position, and a springoperative upon the blocking means to position the same to block thefirst support in its initial position as the second support moves backto its initial position.

4. Apparatus for cutting and removing the burr from the trailing end ofa long- Work piece, such as tube, which is being fed lengthwisecomprising, a xed standard positioned substantially on the center lineof the work piece, a rst pivoted support on one side of the standardhaving a cutting tool thereon, a spring acting upon the support andreacting against the standard tending to move the support in a directionso that the cutting tool moves toward the Work piece, a movable blockingelement on the standard for blocking the rst support and preventing suchmovement, a second support pivotally mounted on the other side of thestandard, a burr removing tool carried by the second support, operatingmeans for swinging the second support to shift the burr removing tooltoward the work piece, a movable controlling element carried by thestandard and actuated as the trailing end of the tube moves therefrom toset the last mentioned means into operation, a trip member on the secondsupport for tripping the said blocking means for movement of the cuttingelement into the Work piece to sever the trailing end thereof as thesec-A ond element is moving toward the workpiece, interengaging means onthe two supports for causing the second support to shift the rst supportthereby moving the cutting tool away from the work piece so that theburr removing tool may be positioned on the axis of the Work piece,control means operated by the second support to set the burr removingtool into operation substantially when the said tool is on the axialcenter or the work piece, control means actuated by the movement of theburr removing tool to cause the operating means to move the secondvsupport back to its original position, a spring operative upon theblocking means to position the same to block the rst support in itsinitial position as the second support moves back to its initialposition, a, supporting element for the work piece pivotally mounted tothe standard and positioned adjacent the cutting tool, a spring forholding the supporting element in position to support the' work piece asthe cutting tool acts thereon, and means interconnecting the supportingelement and the first named support for shifting the supporting elementaway from the work piece as the second support shifts the rst support.

5. An apparatus for performing operations -on long work pieces, such astube, comprising, means for feeding a Work piece lengthwise with step bystep action, mechanism for performing operations on the work piecebetween each feeding step, control means actuated by the presence of awork piece for continued operation of the feeding means and mechanism,said control means being actuated as the trailing end of the work piecepasses the same to thereby discontinue operation of the said feedingmeans and said mechanism, a cutting tool, a movable support for thetool, and means set into operation by said control means, upon saidactuation thereof, for moving the support while the work piece is atrest for causing the tool to cut off the trailing end of the work piece.

6. An apparatus for performing operations on long work pieces, such astube, comprising, means for feeding a work piece lengthwise with step bystep action, mechanism for performing operations on the work piecebetween each feeding step, control means actuated by the presence of awork piece for continued operation of the feeding means and mechanism,said control means being actuated as the trailing end of the work piecepasses the same to thereby discontinue operation of the said feedingmeans and said mechanism, a cutting tool, a support for the tool mountedfor back and forth movement, the tool being normally spaced from thework piece, and means set into operation by said control means, uponsaid actuation thereof, and operable while the work piece is at rest,for movingl the support to cause the cutting tool to cut across the workand thereby sever its trailing end, and then to move back to a positionwith the cutting tool spaced from the work piece.

7. An apparatus for performing operations on long work pieces, such astube, comprising, means for feeding a work piece lengthwise with step bystep action, mechanism for performing operations on the work piecebetween each feedingstep, control means actuated by the presence of awork piece for continued operation of the feeding means and mechanism,said control means being actuated as the trailing end of the work piecepasses the same to thereby discontinue operation of the said feedingmeans and said mechanism, a cutting tool, a movable support therefor, aburr removing tool, a movable support therefor, and means set intooperation by said control means, upon said actuation thereof, andoperable to move said supports in timed relationship to cause thecutting tool to sever the work piece and to move back from the workpiece and to move the burr removing tool onto the axis of the work piecefor acting upon the trailingI end thereof and then for moving the burrremoving tool off the axis of the work piece.

8. An apparatus for performing operations on long work pieces, such astube, comprising', means for feeding a work piece lengthwise with stepby step action, mechanism for performing operations on the work piecebetween each feeding step, control means actuated by the presence of aWork piece for continued operation of the feeding means and mechanism,said control means having an element which is actuated as the trailingend of the work piece passes the same to thereby discontinue operationof the said feeding means and said mechanism, a movably mounted cuttingtool, a movably mounted burr removing tool, means set into operation bysaid control means, upon said actuation thereof, for moving the cuttingtool to cause the same to sever the trailing end of the work piece andthen to move away from the work piece, and for moving the burr removingtool onto the axis of the work piece for acting upon the severedtrailing end to remove the burrs therefrom, and for shifting the burrremoving tool 01T the axis of the work piece, said element of saidcontrol means being actuated upon the placing of another work piece inposition, for resumption of operation of the said feeding means and saidmechanism.

9. An apparatus for performing operations on longwork pieces, such astube, comprising, means for feeding a work piece lengthwise with step bystep action, mechanism for performing operations on the work piecebetween each feeding step, control means actuated by the presence of awork piece for continued operation of the feeding means and mechanism,said control means having an element which is actuated as the trailingend of the work piece passes the same to thereby discontinue operationof the said feeding means and said mechanism, a cutting tool, apivotally mounted support therefor, a burr removing tool, a pivotallymounted support for the burr removing tool, means set into operation bysaid control means, upon said actuation thereof, and operable while thework piece is at rest, for oscillating the support for the cutting toolto cause the same to sever the trailing end of the work piece and foroscillating the support for the burr removing tool, to place the burrremoving tool on the axis of the work piece for acting upon the same toremove burrs therefrom, and for shifting the burr removingl tool awayfrom the axis of the work piece, said element of the said control meansbeing actuated upon the insertion of another work piece for theresumption of the operation of the feeding means and mechanism.

ARTHUR W. PAYNE.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 1,851,276 Gordon Mar. 29, 19321,911,186 Gordon et a1 May 30, 1933 2,225,127 Oppenheim Dec. 17, 19402,454,290 Payne Nov. 23, 1948

